Rebel Conservatives Excel in G.O.P. Fund-Raising, Heralding a Tug Right

Insurgent conservatives seeking to pull the Republican Party to the right raised more money last year than the groups controlled by the party establishment, whose bulging bank accounts and ties to major donors have been their most potent advantage in the running struggle over the party’s future, according to new campaign filings and interviews with officials.

The shift in fortunes among the largest and most influential outside political groups could have an enormous impact in the 2014 election cycle, as the warring Republican factions prepare to square off in a...